#Treeview visual basic.net how to#
#Treeview visual basic.net code#

When a new node is requested, the application opens an instance of the New Node dialog this dialog forces the user to set the name, text, and tag values for the new node. The Form class also contains a context menu this context menu contains two options one to add a new node, and one to delete an existing node. The Form class constructor creates a main node in the TreeView control at runtime, the user may select this node (or any child node originating from this node) to add additional nodes to the TreeView.

' start off by adding a base treeview node Dim mainNode As New TreeNode() Object, _Д«yVal e As System.EventArgs) Handles MyBase.Load Private Sub Form1_Load( ByVal sender As System. The functionality contained in the class is broken up into several regions the class begins with the default class declaration: The main Form class is a standard Windows Form with a few controls added the form contains a split container control on the left hand side of the control is a TreeView control, on the right hand side of the splitter are four group boxes the first group box contains a set of labels and text boxes used to display information about a selected node, the remaining group boxes contain labels, text boxes, and buttons used to conduct different searches of the TreeViewвЂ™s node collection based on the nodeвЂ™s text, name, or tag values.

#Treeview visual basic.net how to#

There is nothing custom or fancy done with any of the TreeView related components in this application it is merely a demonstration of how to work with a TreeView within the context of a Windows Forms application.

The other Form class (Figure 4) is used to create new nodes within the application, this form is displayed by selecting a node from the TreeView and then selecting the вЂњAdd NodeвЂќ option from the context menu.

#Treeview visual basic.net code#

The application solution contains a single Windows Application project comprised all code supplied in support of this project is contained in two Form classes one is the main Form containing the TreeView and a few controls used to display node information (Figures 1, 2, and 3) and to execute searches for a specific node or group of nodes based upon a user supplied search term. Figure 4: Creating a Node with Specific Properties.